Because of its origins high in the Cambrian Mountains and its relatively short length, it is prone to flooding and some roads in the lower catchment can become impassable during very wet weather. It is a relatively pristine river with few polluting inputs and is notable for its Salmon and Sea Trout (migratory Brown Trout).

The catchment area was notable for its now defunct lead mines and slate quarries, especially around Corris and Dinas Mawddwy.